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Operating Revenue (Schedule of Operating Revenue Recognition from Contracts with Customers) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
NGL Midstream |  |
Public Utilities General Disclosures [Line Items] |  |
Sales revenue | $ 108 | $ 170
NGL Midstream | Dominion Energy Gas Holdings, LLC |  |
Public Utilities General Disclosures [Line Items] |  |
Sales revenue | 91 | 138
Renewable Energy Investment Tax Credits | Dominion Energy and Virginia Electric and Power |  |
Public Utilities General Disclosures [Line Items] |  |
Sales revenue | $ 10 | $ 11

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